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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e63611b817198508a5831904d98e18bce151b73625bbd426258545b197bde28' 
  AND token = 'C08SF8We3jIV9d2SfDt7LSlgayGQCXvXrDG6ylrOPtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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