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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2673093464a7ccc5d8a01c804d8b8740af66e28ba4548373f1cab04a54200029' 
  AND token = 'xCc72jDwcOeAV8g21rdTn3VRhTg2ibD13b56rOJgeC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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