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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da8f76d6b25da23554cff5f97dc44694b28d4851b81d0a0e000343726ac2e52a' 
  AND token = '2lXP86ilzuZaEof+f5DfPqkF7XtaPR6c8NZHxjnqLfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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