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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e805e90e71afaac8a8f584d2e1cafa4b110b736a6cd497431b6fd04994eeb21b' 
  AND token = 'Rp9kbRPdts9UEd336yoA4tjOhuGM37lf3kJQ9+0dC6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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