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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d37ac3870b6783baddd9862525fc48190ea5c77a021cf38462d3fb0fe04d324' 
  AND token = 'Cyprol+dJKnvMMf5EV4ihsx7ZQWi/QiB347uAEyeh5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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