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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87fbc97736fac4972cfc8ae558205558c66901782a7d14d5846eab20ab66e5e6' 
  AND token = 'Q8oF4wRcjP9UfGPiTxEre0VW9dKt1o++dJVF8KsUmWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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