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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d2e932fcd6b1d27af64ac91836c27fbe7d8d9803611e9043d67dc013ca5824d' 
  AND token = 'vv68p34NgXW8cDEYWvBBjlAcouV/LEwvm/4mkTc52tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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