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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60cd4f1fc100d5778914180456425012d90bff4e98229e223e1c7336f0fe362a' 
  AND token = 'k5Xh4LXXuTM91yKfibwdsbglZFcM2fpfJeZRhuS50qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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