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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba2e810c21f4bde4a5c24dc1aa2a1ef74628e2e5722f3b95748b31666d3e87c4' 
  AND token = 'ueRqh4x3e7aZHEGxwFkPkfstjjmAtcL5R6elLt3XTv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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