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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebe9ab40856ee1d2a6d3cc702ac19b6fba7669ec1732001e1d50b97834d2489d' 
  AND token = '6DP2Hge3QbcE6Jl+M74YMaL/prFQ+t3exRZ0Z94KxqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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