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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0682ffa0facf5d5bc1553b6385a2f61d4e05d56af6518f477827b7259da09abe' 
  AND token = 'FLAIRqn6TfT3ThksM2anplR6fh/r4dbiaNSXjXbfHdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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