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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '405ed7dbb2b1998723a2555033a8c4da0b52da4168536e91ead465f65f2d44e5' 
  AND token = 'EaexVFlOf77CP70Zhq/A9MkZQj1GHPGBDtAiV6imdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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