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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '860c851cd0084bae6bd78073f4e7e4d2b7128e2bd5e180bc48cd0e6b47e857f1' 
  AND token = 'QZuHp7eA8a7/n4k8d/e3f5ZKG3+dAKzE/Gr/nWRSM78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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