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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72968fe2226d80472a25f81d4f4dcd114e90c4881ada11ca9e3c32f9d2212bdb' 
  AND token = 'vXu3GzfT95AX6Lf42K1pr81QFkw3GRl0TeHhsR9hob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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