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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7d65bd1682b27d3be048fb2fbc26ed2aa5f7beb39eaa77ed4a1b4e8a0c0dfd5' 
  AND token = 'nTcnrU7ieDls/Joza8+DRG7DmR2DSVYqd2vwaHW+N9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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