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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee55027e14c18e37274e60e6e3a938eb0375a54ffb2ecead4d908c3503239a71' 
  AND token = 'WCsVS3KDyumHMY6duUAoePRCpttTm8iB4q+vgksBYQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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