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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'becb286560110e4b46471e0d44a7fc5a889bbbcd09f00fa778cc0f30dbd9cb42' 
  AND token = 'HuEtDoiFENWcMFfCPrmJY6GHW0PrNSwMcSZ6KScKewc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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