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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f5c95ebcb0e943091930721bb2ebc6ff3025d95bf0dc4059e20bcbce3814ed98' 
  AND token = '7SeW9HNJI9uniqc4FOSAezYn+bCTlLzLFPQ4pFZcgjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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