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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '49a7b69255701ce998d42f315dd9a20a7cba2a807902345062f0b15eb18fdace' 
  AND token = 'AI4fO5bqwXXZkN+9eyusvQNBo18+H9id/nWbPFsowYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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