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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5edc026ede9722c7839009f2cb7bf7686c37d98735206856b08c98dede860e98' 
  AND token = 'm8r8PuKepTe5/hQpF090hVsDx+aJKEdsT9zn+X+dCeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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