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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4824d3da719d8a8012fd0e63a45b12a092d45af400a233daf7252a890d2aa187' 
  AND token = 'OZB5F0gCgb/pOJii5iDfLZ7cCmFDi30m9jNNg2snIzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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