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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e7ae94e91c69a75fb8486861a131eac19bb433443e88c0db665bc3c694fec6c' 
  AND token = 'YGEIwFmi0A8eZxcLtfwERI7Ke4qmpIR7a4p+/k2GONA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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