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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f1b0e9e652a764c51b3b57d0655329a9dff6c1885845511b5c137288b4fbb35' 
  AND token = 'WNKTVEJG7Qk05mx78dS6PFH4hux3XLnDhr1kNTFtYhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}