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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5191e212afb0358ecd3290a11ded12213d45eb4667adab5af3b1955c9097de19' 
  AND token = 'EIfT+p3T1Vu/UsKCX+B19tornX0HbZSFXoqNAyQQ3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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