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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '047ed255baa43380b77a6ed54c94063cc4195062cb84f9ed25349c1a6de98463' 
  AND token = '7aC3ofCWP133Jvy0VY+A0R5PaC/LeVfSDyxeYg3v/IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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