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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd62a5b62e091371bc1458127f9fa5e3c6be2a00f7a24d54341fb5949973d3630' 
  AND token = 'NPs45lKi5q0Sae57wK2/6/G4UxxwNcYeuVmBjM60iUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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