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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0e9976a3c5e4dda68e46d9457faf4328708255222eec76322ac2338061acd6f' 
  AND token = 'PJmvB1cWQ0nl6ivfl2LEtjxtsA0Il5wjA5HfMC11Cng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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