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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10b60f9858f4eece6a441fc694e18275070bbb73cc8aaf0cc9a214c2c2467f31' 
  AND token = 'v14aAV8RqCMg5e3RD/LR15lbiO3beHQhE9FGXU8LgKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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