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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '193bde0505a0d855fb6be285e00a6ef5ee7549775fa6a14ef163d72bf43f9eba' 
  AND token = 'PfQSZ9s2b4e9dPyc0jxRjondONwG7RMyCIX5bFA0rFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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