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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4973db2c2df2f033920aaa995349f4f19d54dabde8ff5162875ec33a2ae595f5' 
  AND token = 'AOGMZ3wFlqWQnOHPc/N5Lw1pZ92k/8lPoFoRqnBp6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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