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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '48f660a4e4a7b81f0fd8fb413bed67cc777560f65f81c5d3c3e4ab080d762cba' 
  AND token = 'Q3BkaDHgrsdW1tNgYpdbdYPQ+/jkk7aUwnMIv6S/OB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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