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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c8e1c232bedeb7faf8a959cf466d858e567a0e2c3590ade035d3e5c0161e9e3' 
  AND token = 'sGt7i1+WU2G89AXT8Jb8j/2nMwOYzGkQ+MMNbIzhfE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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