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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dc129d2ba39e69189fadbffd07db48f810d3bc8db8a03362ae8f3ff82f15ea6' 
  AND token = '9L0PGHD8dlLnQR2AtpxQQR8g7VgnXm96Okv+6OEymQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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