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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cae7a884458e7313c529e015cdd85bc9b13a796c7b3500f6f6cfa94649268f0' 
  AND token = 'OtNjmMdNgcYow86bxDV5v/X6Am0lyWof/8B8JIFXraY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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