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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd99ada589fc373c4d6a7b882725915a6e91729b800c48e0a68b28a68c633ba88' 
  AND token = 'g0jLuzk46fTjk4ljyBIH8hERIvJRkBHdwd9CK8gwbrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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