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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '785c8b8f331a76de33b1c16048c3e43e85d537c75c9f4e68fe6ee37e3938dc59' 
  AND token = 'bn3JKI5152YZHkG1rTDs8IcRIIG1Jwt7N1UOMOQJmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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