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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cf632cfb6a2cf3d439b20d520a349ad23623b57c1d6b5b726cd560644161dce' 
  AND token = 'u5z2ayGboduj4s4bQS3r8ZpvA+UIoQdWH0gjupop2Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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