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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '706e28362d1cc28c217e90e3fb6a92d769a74ccdedf713c81c0f3a9595b12613' 
  AND token = '7f/EAyH3w17QeU2vN/utpZZKiPC1pqR+Vt1canoIgak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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