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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74f5eed0c03c36d73e658f86a27377c58f982ee03de434a2f7328d19fc5cfcca' 
  AND token = 'ALdwQKmagxaWt4kdAWL5VcVXiAfORspWvFgHEDGuhmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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