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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00d1714196007277cf09a77f53816fe063df436406d9b1b70162cd2ce544cdb1' 
  AND token = '23Ku2GLP684bCvkORbhR4YlMrNVTPFz/fqdhyo5YUL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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