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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '62a31afffaac8fd646a9deede264918b770f10a7bdb9fd88c4b0941264648880' 
  AND token = 'LxBtz96N6t6E4aAUlecuJYf1T2E2bjnJUgxLU2pT8J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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