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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '24ff45c0ed581e5df6c87fec71d24e9017c2da46ed0ea0226325755791e10e38' 
  AND token = 'VV3FDkBD7I1crzr7uJpjewhXJgh+3g2oyYdsepyX+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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