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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fe60e85f8328c25edab8ee2dcd47ec90fce301a1161871d93f35ff5aefbdcc0' 
  AND token = 'iwDI8kwwTozFnxVD2dmCh8yIFuTDH+Yz7KahMfMeL2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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