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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '034b4af8b606fd589b3334e334920afb42d68d794a23f6d6b3d3de013523ddd5' 
  AND token = '0rUKRBsK5otTWEX3gNFD36fb7zBBGSLmZH2luo1t3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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