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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d2427cba2aa9f0dd8b5bc0f66c5c460873412474f70232a0e77ae02a77bc413' 
  AND token = 'rqcbuLzGK/0IW0lS1HeJa08Yzx+WWk1kapu6aCUwn3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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