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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9d50d4556dc6eaab1bb32472cdb57e2acd5c8335a3221a980537784f178b22b' 
  AND token = 'oODLI4y4d85HayNMgRh40gAms57UmKPXE59vr/Wsuxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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