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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6db31d2cb50e0dd66c8da3d10e3404d8cdd4d39c3f9915f6b9d7901270aa0d41' 
  AND token = 'MCWxYK8CWW3WhRrhuhBrsLw8F2l7Ok3H90xkEi70ruw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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