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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a85052e1659360eb79158f7d5f8152acf12dfbca16d0a0f52028da1e83e5759d' 
  AND token = 'B3KvhsZeiTRAV1K1xmRzWBdB+ZLtSAbHLwSlM50M1R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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