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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e320c83fce5caa4be1a04fff1ce72e70fbd00090073a951e58a743abdafe2853' 
  AND token = 'O4tpGfM4ALbT2LEIUxITSzRFWhkB9JdyaPh2jBa/uQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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