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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd56ef559731ecd7cb94e8185ea646964f72dfd19e07e7b3af21931182d29ecab' 
  AND token = '9EfXy8IlVXwfiDWbi/9fSj9l8kXAOPj4j2SdkhryppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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