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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '901cb076c4aa7301559dc69a3f2b4c3eb817cdf17a24822a1b3cd72a5a2c77c5' 
  AND token = 'RzTRAtY8BSuuHnhhJ1TMPFIEU5p4LptXHnimMzkxrZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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