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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1c7c67ea969d820fe70bb88c56afb26b69345252c7a2a50e1e70962b2e1ba2d6' 
  AND token = 'kmoLn1zYbWrdpJ+Qm1pkjU1ulOOqymh55tjXW4O8MNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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