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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fdaf7a5c3d60e1db6aed3ec2884780bab822c8a20ca08838199deb6d7369843' 
  AND token = 'M0ssP+V8W1uPcDPQTPc8CDNun0BXY7GkSfeskJxKxdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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