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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '379b0198e57b0725f5ac81e70c37030e8e0b80fd110502b6f56541287e88cf3c' 
  AND token = 'z5jhRxCH0gMx0dfxJBIiaPUj2Qos3a/ytUo+wI5akP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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