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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '632c9ac0013e43d3d20cb5852e9716df38571461678d9978c42239f366a7e82a' 
  AND token = 'EpIQpQMjRUQQ6pkgR6XoNH6SoMmuRH2pJDqwCRiNGvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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