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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bacd09db6fa640301a371c083f4f5cf886b3db369e24a25db44f2c33db8cb27' 
  AND token = '+M5P8XkokJMi0cu6JHW1LaGte4ft/Du+dnh4R098DH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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