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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '775d99b277b9c6b1171600c0eb7d027f4f23405384367cd2ceb62b787a72400e' 
  AND token = 'nea5a0JNghLZzT4E0M+vC6eo9PtkriK97haIggAYv2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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